Buggy code:
public class Main { public static final String THROWN_PREFIX = ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( "Exception<seq2seq4repair_space>thrown<seq2seq4repair_space>from<seq2seq4repair_space>AspectJ<seq2seq4repair_space>" + ( Version . text ) ) + ( LangUtil . EOL ) ) + "" ) + ( LangUtil . EOL ) ) + "This<seq2seq4repair_space>might<seq2seq4repair_space>be<seq2seq4repair_space>logged<seq2seq4repair_space>as<seq2seq4repair_space>a<seq2seq4repair_space>bug<seq2seq4repair_space>already<seq2seq4repair_space>--<seq2seq4repair_space>find<seq2seq4repair_space>current<seq2seq4repair_space>bugs<seq2seq4repair_space>at" ) + ( LangUtil . EOL ) ) + "<seq2seq4repair_space>http:////bugs.eclipse.org//bugs//buglist.cgi?product=AspectJ&component=Compiler" ) + ( LangUtil . EOL ) ) + "" ) + ( LangUtil . EOL ) ) + "Bugs<seq2seq4repair_space>for<seq2seq4repair_space>exceptions<seq2seq4repair_space>thrown<seq2seq4repair_space>have<seq2seq4repair_space>titles<seq2seq4repair_space>File:line<seq2seq4repair_space>from<seq2seq4repair_space>the<seq2seq4repair_space>top<seq2seq4repair_space>stack,<seq2seq4repair_space>" ) + ( LangUtil . EOL ) ) + "e.g.,<seq2seq4repair_space>\"SomeFile.java:243\"" ) + ( LangUtil . EOL ) ) + "" ) + ( LangUtil . EOL ) ) + "If<seq2seq4repair_space>you<seq2seq4repair_space>don't<seq2seq4repair_space>find<seq2seq4repair_space>the<seq2seq4repair_space>exception<seq2seq4repair_space>below<seq2seq4repair_space>in<seq2seq4repair_space>a<seq2seq4repair_space>bug,<seq2seq4repair_space>please<seq2seq4repair_space>add<seq2seq4repair_space>a<seq2seq4repair_space>new<seq2seq4repair_space>bug" ) + ( LangUtil . EOL ) ) + "at<seq2seq4repair_space>http:////bugs.eclipse.org//bugs//enter_bug.cgi?product=AspectJ" ) + ( LangUtil . EOL ) ) + "To<seq2seq4repair_space>make<seq2seq4repair_space>the<seq2seq4repair_space>bug<seq2seq4repair_space>a<seq2seq4repair_space>priority,<seq2seq4repair_space>please<seq2seq4repair_space>include<seq2seq4repair_space>a<seq2seq4repair_space>test<seq2seq4repair_space>program" ) + ( LangUtil . EOL ) ) + "that<seq2seq4repair_space>can<seq2seq4repair_space>reproduce<seq2seq4repair_space>this<seq2seq4repair_space>exception." ) + ( LangUtil . EOL ) ; private static final String OUT_OF_MEMORY_MSG = ( ( ( ( ( ( ( ( ( ( ( ( ( "AspectJ<seq2seq4repair_space>" + ( Version . text ) ) + "<seq2seq4repair_space>ran<seq2seq4repair_space>out<seq2seq4repair_space>of<seq2seq4repair_space>memory<seq2seq4repair_space>during<seq2seq4repair_space>compilation:" ) + ( LangUtil . EOL ) ) + ( LangUtil . EOL ) ) + "Please<seq2seq4repair_space>increase<seq2seq4repair_space>the<seq2seq4repair_space>memory<seq2seq4repair_space>available<seq2seq4repair_space>to<seq2seq4repair_space>ajc<seq2seq4repair_space>by<seq2seq4repair_space>editing<seq2seq4repair_space>the<seq2seq4repair_space>ajc<seq2seq4repair_space>script<seq2seq4repair_space>" ) + ( LangUtil . EOL ) ) + "found<seq2seq4repair_space>in<seq2seq4repair_space>your<seq2seq4repair_space>AspectJ<seq2seq4repair_space>installation<seq2seq4repair_space>directory.<seq2seq4repair_space>The<seq2seq4repair_space>-Xmx<seq2seq4repair_space>parameter<seq2seq4repair_space>value" ) + ( LangUtil . EOL ) ) + "should<seq2seq4repair_space>be<seq2seq4repair_space>increased<seq2seq4repair_space>from<seq2seq4repair_space>64M<seq2seq4repair_space>(default)<seq2seq4repair_space>to<seq2seq4repair_space>128M<seq2seq4repair_space>or<seq2seq4repair_space>even<seq2seq4repair_space>256M." ) + ( LangUtil . EOL ) ) + ( LangUtil . EOL ) ) + "See<seq2seq4repair_space>the<seq2seq4repair_space>AspectJ<seq2seq4repair_space>FAQ<seq2seq4repair_space>available<seq2seq4repair_space>from<seq2seq4repair_space>the<seq2seq4repair_space>documentation<seq2seq4repair_space>link" ) + ( LangUtil . EOL ) ) + "on<seq2seq4repair_space>the<seq2seq4repair_space>AspectJ<seq2seq4repair_space>home<seq2seq4repair_space>page<seq2seq4repair_space>at<seq2seq4repair_space>http:////www.eclipse.org//aspectj" ; public static void main ( String [ ] args ) throws IOException { } public static int bareMain ( String [ ] args , boolean useSystemExit , List fails , List errors , List warnings , List infos ) { } private static void readMessages ( IMessageHolder holder , IMessage . Kind kind , boolean orGreater , List sink ) { } public static String renderExceptionForUser ( Throwable thrown ) { String m = thrown . getMessage ( ) ; <START_BUG> return ( ( ( Main . THROWN_PREFIX ) + ( null != m ? m + "\n" : "" ) ) + ( CompilationAndWeavingContext . getCurrentContext ( ) ) ) + ( LangUtil . renderException ( thrown , true ) ) ; <END_BUG> } private static String parmInArgs ( String flag , String [ ] args ) { } private static boolean flagInArgs ( String flag , String [ ] args ) { } private static void appendNLabel ( StringBuffer sink , String label , int numItems ) { } protected Main . CommandController controller ; protected String commandName ; private IMessageHolder clientHolder ; protected final MessageHandler ourHandler ; private int lastFails ; private int lastErrors ; private Runnable completionRunner ; public Main ( ) { } public MessageHandler getMessageHandler ( ) { } void setController ( Main . CommandController controller ) { } public void runMain ( String [ ] args , boolean useSystemExit ) { } public void run ( String [ ] args , IMessageHolder holder ) { } public void quit ( ) { } public void setHolder ( IMessageHolder holder ) { } public void setCompletionRunner ( Runnable runner ) { } protected void systemExit ( IMessageHolder messages ) { } protected void outMessage ( String message ) { } protected boolean report ( boolean pass , IMessageHolder holder ) { } protected static void fail ( IMessageHandler handler , String message , Throwable thrown ) { } public static class MessagePrinter implements IMessageHandler { public static final IMessageHandler VERBOSE = new Main . MessagePrinter ( true ) ; public static final IMessageHandler TERSE = new Main . MessagePrinter ( false ) ; final boolean verbose ; protected MessagePrinter ( boolean verbose ) { } public boolean handleMessage ( IMessage message ) { } public static String render ( IMessage message ) { } public boolean isIgnoring ( IMessage . Kind kind ) { } public void dontIgnore ( IMessage . Kind kind ) { } protected PrintStream getStreamFor ( IMessage . Kind kind ) { } } public static class LogModeMessagePrinter extends Main . MessagePrinter { protected final PrintStream logStream ; public LogModeMessagePrinter ( boolean verbose , PrintStream logStream ) { } protected PrintStream getStreamFor ( IMessage . Kind kind ) { } } public static class CommandController { public static String TAG_FILE_OPTION = "-XincrementalFile" ; public static String INCREMENTAL_OPTION = "-incremental" ; public static long MAX_DELAY = 1000 * 600 ; public static long DEFAULT_DELAY = 1000 * 5 ; private static String [ ] [ ] OPTIONS = new String [ ] [ ] { new String [ ] { Main . CommandController . INCREMENTAL_OPTION } , new String [ ] { Main . CommandController . TAG_FILE_OPTION , null } } ; private boolean running ; private boolean quit ; private boolean incremental ; private File tagFile ; private long fileModTime ; private long delay ; private boolean buildFresh ; public CommandController ( ) { } public String [ ] init ( String [ ] args , IMessageHandler sink ) { } public boolean running ( ) { } public void setDelay ( long delay ) { } public boolean incremental ( ) { } public boolean commandLineIncremental ( ) { } public void quit ( ) { } boolean buildFresh ( ) { } boolean doRepeatCommand ( ICommand command ) { } protected void fileCheckDelay ( ) { } } }

Fix:
return ( ( ( ( Main . THROWN_PREFIX ) + ( null != m ? m + "\n" : "" ) ) + "\n" ) + ( CompilationAndWeavingContext . getCurrentContext ( ) ) ) + ( LangUtil . renderException ( thrown , true ) ) ;